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MAX22192
Octal Industrial Digital Input with
Diagnostics and Digital Isolation
General Description
Benefits and Features
The MAX22192 is an IEC 61131-2 compliant industrial
digital input device with integrated digital isolation. The
MAX22192 translates eight, 24V current-sinking, indus-
trial inputs to an isolated serialized SPI-compatible output
that interfaces with 1.71V to 5.5V logic voltage. A current-
setting resistor allows the MAX22192 to be configured for
Type 1, Type 2, or Type 3 inputs. For proximity switches,
the field-wiring is verified using the wire break feature.
When wire break is enabled, the LFAULT output is assert-
ed and a register flag set if the input current drops below
the wire break threshold for more than 20ms. Additional
diagnostics that assert LFAULT include: overtemperature
protection, low 24V field supply, 24V field supply missing,
and CRC communication error.
● High Integration Reduces BOM Count and Board Space
• Eight Input Channels with Serializer
• Integrated Isolation of 600V
for 60s (V
)
RMS
ISO
• Operates Directly from Field Supply (7V to 65V)
• Compatible with 1.8V, 3.3V or 5V Logic
• 6mm x 10mm GQFN Package
● Reduced Power and Heat Dissipation
• Accurate Input-Current Limiters
• Energyless Field-Side LED Drivers
● Fault Tolerant with Built-In Diagnostics
• Input Protection to ±40V with Low-Input Leakage
Current
• Wire-Break Detection
• Integrated Field-Supply Voltage Monitors
• Integrated Overtemperature Monitors
• 5-Bit CRC Code Generation for Error Detection
For robust operation in industrial environments, each input
includes a programmable glitch filter. The filter delay on
each channel can be independently programmed to one
of eight values between 50µs and 20ms, or filter bypass.
● Configurability Enables a Wide Range of Applications
• Configurable IEC 61131-2 Type 1, 2, 3 Inputs
• Configurable Input Current-Limiting from 0.5mA to
3.4mA
The MAX22192 has an isolated 4-pin SPI interface, and
in addition uses isolated LLATCH input for synchronizing
input data across multiple devices in parallel, and iso-
lated LFAULT output for instantly alerting the host of any
diagnostic issues. The digital signals with a name starting
with L are logic-side signals, and the digital signals with a
name starting with F are field-side signals.
• Selectable Input Glitch Filter
• Capable of Daisy-Chaining Other Field-Side De-
vices Sharing Isolated SPI
● Robust Design
The MAX22192 field-side accepts a single 7V to 65V sup-
• ±8kV Contact ESD and ±15kV Air-Gap ESD Using
Minimum 1kΩ Resistor
• ±1kV Surge Tolerant Using Minimum 1kΩ Resistor
• -40°C to +125°C Ambient Operating Temperature
ply to the V
pin. When powered by the field supply,
DD24F
the MAX22192 generates a 3.3V output on the V
pin
DD3F
from an integrated LDO regulator, which can provide up to
25mA of current for external loads in addition to powering
the MAX22192. Alternatively, the MAX22192 can be pow-
Applications
● Programmable Logic Controllers
ered from a 3.0V to 5.5V supply connected to the V
DD3F
pin. The logic-side of the MAX22192 is powered from a
● Industrial Automation
single 1.71V to 5.5V supply to the V
with 1.8V, 3.3V, or 5V logic levels.
pin to interface
● Process Automation
DDL
Safety Regulatory Approvals
● UL According to UL1577
● cUL According to CSA Bulletin 5A
The MAX22192 has an isolation rating of 600V
for 60
RMS
seconds and is available in a 70-pin GQFN package with
2.3mm clearance and creepage. The package material
has a minimum comparative tracking index (CTI) of 600V,
which gives it a group I rating in creepage tables.
Ordering Information and Typical Operating Circuits appear
at end of data sheet.
19-100406; Rev 3; 9/20
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